Phonological short-term memory and new word learning in children.

Sixty-five 5-year old children participated in 4 experimental tasks of word learning that varied systematically in the amounts of phonological and nonphonological learning required. Measures of the children's performances on 2 measures of phonological memory (digit span and nonword repetition), vocabulary knowledge, and nonverbal ability were also obtained. Learning of the sound structures of new words was significantly, and to some degree independently, associated with aspects of both phonological memory skill and vocabulary knowledge. Learning of pairs of familiar words was linked with current vocabulary knowledge, although not with phonological memory scores. The findings suggest that both existing lexical knowledge and phonological short-term memory play significant roles in the long-term learning of the sounds of new words. The study also provides evidence of both shared and distinct processes contributing to nonword repetition and digit span tasks. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The role of inferior parietal and inferior frontal cortex in working memory.

Verbal working memory involves two major components: a phonological store that holds auditory-verbal information very briefly and an articulatory rehearsal process that allows that information to be refreshed and thus held longer in short-term memory (A. Baddeley, 1996, 2000; A. Baddeley & G. Hitch, 1974). In the current study, the authors tested two groups of patients who were chosen on the basis of their relatively focal lesions in the inferior parietal (IP) cortex or inferior frontal (IF) cortex. Patients were tested on a series of tasks that have been previously shown to tap phonological storage (span, auditory rhyming, and repetition) and articulatory rehearsal (visual rhyming and a 2-back task). As predicted, IP patients were disproportionately impaired on the span, rhyming, and repetition tasks and thus demonstrated a phonological storage deficit. IF patients, however, did not show impairment on these storage tasks but did exhibit impairment on the visual rhyming task, which requires articulatory rehearsal. These findings lend further support to the working memory model and provide evidence of the roles of IP and IF cortex in separable working memory processes. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The use of nonword repetition as a test of phonological memory in children with Down syndrome

Recent research suggests a significant relationship between verbal short-term memory and normal language development. Although poor short-term memory and impaired language are features of Down syndrome there has been little investigation of the relationship between these functions in this population, and no studies have included the nonword repetition test devised by Gathercole and Baddeley on which much of the evidence from normal development is based. This study reports the use of nonword repetition with 33 children and teenagers with Down syndrome aged from 5 to 18 years, and investigates the relationship between this test and other memory and language measures. Word repetition was included as an indirect control for the perceptual and speech impairments often associated with this group. Words were repeated significantly more successfully than nonwords and both these tasks were sensitive to word length. Nonword repetition was significantly correlated with age, and when age and nonverbal cognitive ability were controlled, nonword repetition was significantly correlated with all other language-based memory measures, i.e. auditory digit span, word span, sentence repetition, and fluency, and also with memory for a sequence of hand movements, but not with memory for faces or a visual digit span task. There was also a significant relationship between nonword repetition and receptive vocabulary, language comprehension, and reading. When performance on the word repetition task was controlled in addition to age and nonverbal ability, significant correlations between nonword repetition and word span, sentence memory, hand movements, language comprehension, and reading remained. Fewer relationships between auditory digit span and these other measures were established; in particular, there was no association between digit span and the language and reading measures. Results suggest that nonword repetition is a reliable measure of phonological memory in Down syndrome and can predict language comprehension and reading ability.     

Word-frequency and phonological-neighborhood effects on verbal short-term memory.

Immediate memory span and maximal articulation rate were assessed for word sets differing in frequency, word-neighborhood size, and average word-neighborhood frequency. Memory span was greater for high- than low-frequency words, greater for words from large than small phonological neighborhoods, and greater for words from high- than low-frequency phonological neighborhoods. Maximal articulation rate was also facilitated by word frequency, phonological-neighborhood size, and neighborhood frequency. In a final study all 3 lexical variables were found to influence the recall outcome for individual words. These effects of phonological-word neighborhood on memory performance suggest that phonological information in long-term memory plays an active role in recall in short-term-memory tasks, and they present a challenge to current theories of short-term memory. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Predictors of reading and spelling abilities in first- and second-language learners.

This study examined the basic literacy skills and related processes of 1st- through 4th-grade children speaking English as a 1st language (L1) and English as a 2nd language (ESL). The performances of the L1 and ESL children on phonological awareness, word and pseudoword reading, and word and pseudoword spelling tasks were highly similar. The ESL children were at an advantage with regard to lexical access but performed more poorly on verbal working memory and syntactic awareness tasks. The results suggest that the main processes underlying L1 children's basic reading ability in Grades 1 and 2, namely phonological awareness and lexical access, are of equal importance for ESL children. Phonological awareness remained the strongest predictor of word reading ability for L1 and ESL children in Grades 3 and 4. However, the processes involved in L1 and ESL word reading and spelling appeared to vary at other points. Verbal working memory and syntactic awareness were found to be of importance for the word reading and spelling abilities of L1 children but not for ESL children. Lexical access was found to be of more importance for ESL children. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

What is phonological awareness?

Phonological awareness was hypothesized to be composed of at least 3 component skills—IQ, verbal short-term memory, and speech perception. In addition, 4 linguistic manipulations within 3 phonological awareness tasks were theorized to affect item difficulties. Multiple measures of IQ, verbal short-term memory, speech perception, and phonological awareness were administered to 136 3rd and 4th graders. Application of structural equation modeling revealed that IQ, speech perception, and verbal short-term memory each contributed unique variance to the phonological awareness construct. All 4 experimental linguistic manipulations influenced phonological awareness item difficulties as well. Results underscore the importance of speech perception for phonological awareness. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Growth in reading skills of children from diverse linguistic backgrounds: Findings from a 5-year longitudinal study.

This article reports on the results of a longitudinal investigation of the reading development of a sample of 824 children (406 girls, 418 boys). The sample included 689 native English-speaking (L1) children and 135 English-language learners (ELLs) representing 33 different native languages. In kindergarten and 4th grade, children's word reading, spelling, phonological processing, syntactic awareness, and working memory skills were assessed with standardized and experimental measures. In addition, word reading was assessed from kindergarten through 4th grade, and reading comprehension in 4th grade. Comparisons of reading skills between the ELLs and the L1 speakers demonstrated that despite slightly lower performance of the ELLs on several kindergarten tasks, differences at 4th grade were negligible. Fourth-grade word reading was predicted by the same kindergarten tasks for both language groups, and prediction of reading comprehension differed by only 1 task. Finally, the trajectory of word reading was nonlinear for both groups, although predictors of this trajectory differed between groups. The findings suggest that early identification models established through research with L1 speakers are appropriate for identifying ELLs at risk for reading difficulties. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Transfer among phonological tasks in kindergarten: Essential instructional content.

The construct of phonological awareness was explored by examining the effects of instructional treatments on the development of specific and generalized phonological skills for kindergarten children. Sixty-six children with low phonological manipulation skills were randomly assigned to 1 of 2 treatments or a control condition: (a) auditory blending and segmenting with limited letter–sound correspondences; (b) a global array of phonological tasks, with letter–sound correspondences; or (c) only letter–sound instruction. Children in both treatments showed improved phonological abilities, which transferred to a reading analog task. Treated children achieved a level of phonological awareness comparable to that of higher skilled children. The combination of blending and segmenting instruction encouraged generalized phonological awareness; however, the ability to blend and segment accounted for more variance in reading analog scores than did other phonological tasks. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Effects of two types of phonological awareness training on word learning in kindergarten children.

The effects of 2 types of oral-language training programs on development of phonological awareness skills and word learning ability were examined. One of the training programs provided explicit instruction on both analytic (segmenting) and synthetic (blending) phonological tasks; the other program trained synthetic skills only. Effects of these programs were contrasted with a language-experience control group that received no phonologically oriented training. 48 kindergarten children participated in small-group training sessions 3 times per week for 7–8 wks. Children who received both analytic and synthetic training improved significantly on both types of skills, whereas children receiving the synthetic skills training alone improved only on blending skills. Only children receiving training on both types of tasks showed a positive training effect for the word learning or reading analog task. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The effect of presentation rate on serial memory in young children with specific language impairment

The study examined the serial memory ability of a group of preschool children with specific language impairment (SLI) who were compared to age and language control groups. The children were asked to recognize serial patterns under short and long presentation durations. The subjects were presented with images of common objects (that appeared to be easily recoded into a phonological form) and iconic images of scribble drawings and unfamiliar faces (that did not appear to invite recoding). Under long presentation conditions, the performance of children with SLI resembled that of their age-matched peers on all 3 types of tasks. However, under short presentation conditions, children with SLI performed worse than their age-matched peers on all 3 tasks (and similarly to their language-matched peers). The performance of the children with SLI declined dramatically in all conditions when the items were presented for a brief period. If the serial memory deficits of young children with SLI were specific to phonological processing, their performance on recognizing the pattern of common objects should have been impaired, but not their performance with other visual tasks that are less likely to be recoded. Instead, serial memory in children with SLI was affected by presentation duration across tasks. The findings suggest that recognizing serial patterns is dependent, in part, on the speed of processing serial information. The findings are discussed in relation to models of limited capacity processing.     

Development of grammatical-sensitivity, phonological, and short-term memory skills in normally achieving and learning disabled children.

The development of a variety of grammatical-sensitivity and phonological skills was studied in 138 normally achieving, 65 reading-disabled, 63 arithmetic-disabled, and 15 attention deficit disordered (hyperactive) children 7 to 14 years old. Word recognition and phonics skills were highly related, and reading comprehension and phonics skills were less so. Grammatical sensitivity and short-term memory were significantly correlated with a variety of reading skills. Children with a reading disability showed a significant lag in the development of grammatical sensitivity and short-term memory and an even greater deficit in phonological skills. The children with a specific arithmetic disability had adequate grammatical abilities, but below-average memory skills at all ages. Children with an attention deficit but normal achievement scores did not have any major difficulties except on a reading-comprehension task that appears to have significant memory and attention components. The acquisition of reading skills is closely related to the development of grammatical and phonological skills, and deficiencies in these areas are related to difficulties with the acquisition of written language skills. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Examination of the working memory components in normal aging and in dementia of the Alzheimer type

The verbal and attentional components of working memory were examined in patients with Alzheimer's disease, normal elderlies, and young controls. Patients with Alzheimer's disease, showed a reduced span but were sensitive to word length. This is indicative of a functional rehearsal procedure. However, the effect of phonological similarity on immediate recall was smaller in patients with Alzheimer's disease and these patients showed a depressed performance in tasks of phonological analysis. There was also a significant decrement in a task that assessed the attentional component of working memory. Examination of individual patterns of performance showed that the phonological deficiency was severe in a subgroup of patients while the attentional deficit was more general.     

The dimensionality of phonological awareness: An application of item response theory.

A battery of 7 tasks composed of 105 items thought to measure phonological awareness skills was administered to 945 children in kindergarten through 2nd grade. Results from confirmatory factor analysis at the task level and modified parallel analysis at the item level indicated that performance on these tasks was well represented by a single latent dimension. A 2-parameter logistic item response (IRT) model was also fit to the performance on the 105 items. Information obtained from the IRT model demonstrated that the tasks varied in the information they provided about a child's phonological awareness skills. These results showed that phonological awareness, as measured by these tasks, appears to be well represented as a unidimensional construct, but the tasks best suited to measure phonological awareness vary across development. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Counting on working memory when learning to count and to add: A preschool study.

In this study, the author aimed at measuring how much limited working memory capacity constrains early numerical development before any formal mathematics instruction. To that end, 4- and 5-year-old children were tested for their memory skills in the phonological loop (PL), visuo-spatial sketchpad (VSSP), and central executive (CE); they also completed a series of tasks tapping their addition and counting skills. A general vocabulary test was given to examine the difference between the children’s numerical and general vocabulary. The results indicated that measures of the PL and the CE, but not those of the VSSP, were correlated with children’s performance in counting, addition and general vocabulary. However, the predictive power of the CE capacity was significantly stronger than that of the PL capacity. Poor CE capacity should thus be taken into consideration when identifying children at risk of experiencing learning disabilities. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Young children's phonological awareness and nonword repetition as a function of vocabulary development.

The role of vocabulary growth in the development of two reading-related phonological processes was examined. In Experiments 1 and 2, 4- and 5-year-olds and a sample of first graders performed better on phonological awareness tasks for word versus pseudoword stimuli, and for highly familiar versus less familiar words. Three- and 4-year-olds in Experiment 3 performed better for words with many versus few similarly sounding items in a listener's lexicon. Vocabulary was strongly associated with nonword repetition scores for 3- to 5-year olds. The shared variance of this association was accounted for by phonological awareness measures and did not appear to be due to phonological short-term memory, as previously argued. The author proposes that vocabulary growth, defined in terms of absolute size, word familiarity, and phonological similarity relations between word items, helps to explain individual differences in emerging phonological awareness and nonword repetition. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Speech perception, vocabulary, and the development of reading skills in english among Korean- and English-speaking children.

This study examined the roles of speech perception and phonological processing in reading and spelling acquisition for native and nonnative speakers of English in the 1st grade. The performance of 50 children (23 native English speakers and 27 native Korean speakers) was examined on tasks assessing reading and spelling, phonological processing, speech perception, and receptive vocabulary at the start and end of the school year. Korean-speaking children outperformed native English speakers on each of the literacy measures at the start and end of 1st grade, despite differences in their initial phonological representations and processing skills. Furthermore, speech perception and phonological processing were important contributors to early literacy skills, independent of oral language skills, for children from both language groups. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Growth in working memory and mathematical problem solving in children at risk and not at risk for serious math difficulties.

The influence of cognitive growth in working memory (WM) on mathematical problem solution accuracy was examined in elementary school children (N = 353) at risk and not at risk for serious math problem solving difficulties. A battery of tests was administered that assessed problem solving, achievement, and cognitive processing (WM, inhibition, naming speed, phonological coding) in children in 1st, 2nd, and 3rd grade across 3 testing waves. The results were that (a) children identified as at risk for serious math problem solving difficulties in Wave 1 showed less growth rate and lower levels of performance on cognitive measures than did children not at risk; (b) fluid intelligence and 2 components of WM (central executive, visual-spatial sketchpad) in Wave 1 (Year 1) predicted Wave 3 word problem solving solution accuracy; and (c) growth in the central executive and phonological storage component of WM was related to growth in solution accuracy. The results support the notion that growth in WM is an important predictor of children's problem solving beyond the contribution of reading, calculation skills, and individual differences in phonological processing, inhibition, and processing speed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Information processing by school-age children with specific language impairment: evidence from a modality effect paradigm

School-age children with specific language impairment (SLI) and age-matched controls were tested for immediate recall of digits presented visually, auditorily, or audiovisually. Recall tasks compared speaking and pointing response modalities. Each participant was tested at a level that was consistent with her or his auditory short-term memory span. Traditional effects of primacy, recency, and modality (an auditory recall advantage) were obtained for both groups. The groups performed similarly when audiovisual stimuli were paired with a spoken response, but children with SLI had smaller recency effects together with an unusually poor recall when visually presented items were paired with a pointing response. Such results cannot be explained on the basis of an auditory or speech deficit per se, and suggest that children with SLI have difficulty either retaining or using phonological codes, or both, during tasks that require multiple mental operations. Capacity limitations, involving the rapid decay of phonological representations and/or performance limitations related to the use of less demanding and less effective coding and retrieval strategies, could have contributed to the working memory deficiencies in the children with SLI.     

On subtypes of developmental dyslexia: Evidence from processing time and accuracy scores.

Determined the proportion of phonological dyslexics (Ph-DYS) and surface dyslexics (S-DYS) in a population of French dyslexics by applying A. Castles and M. Coltheart's (1993) regression method to 2 diagnostic measures: pseudo-word and irregular-word processing time. 31 dyslexics were matched to 19 average readers of the same age (aged 10 yrs, CA controls) and to 19 younger children of the same reading level (aged 8 yrs, RL controls). Compared to CA controls, there were more Ph-DYS than S-DYS. Compared to RL controls, there were still a high number of Ph-DYS. The reliability of these subtypes across different measures of phonological and orthographic skills was also examined. Compared to RL controls, both groups of dyslexics were found to be impaired only in phonological skills. The moment at which the 2 dissociated profiles emerged in the course of cognitive development was assessed by examining data that was collected when the children were 7 and 8 yrs old. The results show that only the S-DYS's orthographic deficit increased with development. The authors also looked at whether the Ph-DYS and S-DYS profiles were associated with other specific cognitive deficits. Specific deficits in phonemic awareness and in phonological short-term memory were found for both Ph-DYS and S-DYS. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

A longitudinal study of phonological processing skills in children learning to read in a second language.

English-speaking children (N?=?122) in French immersion classes participated in a 1-year longitudinal study of the relation between phonological awareness and reading achievement in both languages. Participants were administered measures of word decoding and of phonological awareness in French and in English as well as measures of cognitive ability, speeded naming, and pseudoword repetition in English only. The relation of phonological awareness in French to reading achievement in each of the languages was equivalent to that in English. These relations remained significant after partialing out the influences of speeded naming and pseudoword repetition. Phonological awareness in both languages was specifically associated with 1-year increments in decoding skill in French. These findings support the transfer of phonological awareness skills across alphabetic languages. (PsycINFO Database Record (c) 2010 APA, all rights reserved)